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Related Experiment Videos

Hand preference in infant rhesus macaques (Macaca mulatta)

G C Westergaard1, M Champoux, S J Suomi

  • 1Laboratory of Comparative Ethology, National Institute of Child Health and Human Development, National Institutes of Health Animal Center, Poolesville, MD 20837, USA. westergg@lce.nichd.nih.gov

Child Development
|June 1, 1997
PubMed
Summary

Infant rhesus macaques show a left-hand preference in reaching and coordination tasks. This suggests an early right hemisphere advantage in these primates, potentially linked to vocalization processing.

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Area of Science:

  • Primate behavior and development
  • Neuroscience
  • Comparative psychology

Background:

  • Hand preference, or lateralization, is a key aspect of motor control.
  • Understanding its development in non-human primates offers insights into human brain evolution.
  • Rhesus macaques (Macaca mulatta) are a common model for studying primate cognition and behavior.

Purpose of the Study:

  • To investigate hand preference in infant rhesus macaques.
  • To determine if hand preference differs between unimanual and bimanual tasks.
  • To explore potential links between motor lateralization and hemispheric specialization.

Main Methods:

  • Assessed hand preference in 20 infant rhesus macaques (4-11 months old).
  • Utilized a unimanual reaching task with raisins.

Related Experiment Videos

  • Employed a bimanual coordination task involving tubes with raisin paste.

    • Main Results:

    • A population-level bias towards left-hand use was observed in both tasks.
    • This suggests an early right hemisphere advantage for motor control in infant macaques.
    • Further neuroimaging is recommended to confirm hemispheric involvement.

    Conclusions:

    • Infant rhesus macaques exhibit a left-hand preference, indicating early motor lateralization.
    • This finding supports the hypothesis of an early right hemisphere advantage.
    • Development of bimanual coordination preference may relate to auditory processing specialization.